He Jose,Personnaly, I don't see any prb to move & back to consultancy, it's just question about good reasons. Actually, moving to the operationnal side(google) may give our firend a lot of benefits(making decision, negociation, and google culture which one of the most respectful...)Personnaly, I think doing strategy at google will be more benefic than doing it at Mckinsey, for the sample reason that at mckinsey u just recommand a solution....